/Engine/Plugins/Runtime/Metasound/Source/MetasoundGraphCore/Public/MetasoundVertex.h
FInputVertexInterface is aTVertexInterfaceGroupwhich holds FInputDataVertexes.
typedef [TVertexInterfaceGroup](API\Plugins\MetasoundGraphCore\TVertexInterfaceGroup)< [FInputDataVertex](API\Plugins\MetasoundGraphCore\FInputDataVertex) > FInputVertexInterface